Are you using a browser that doesn't support JavaScript or have you disabled JavaScript?

If you have disabled JavaScript, you must re-enable JavaScript to use this page.
Or you can view this record using the Text Only Format.

[Keyword='MINKE WHALE']

NMML 2000 Bering Sea Shelf Cetacean Survey

Entry ID:
seamap122

Summary

Abstract:
Visual line-transect surveys for cetaceans were conducted in the southeastern Bering Sea (SEBS) from 10 June to 3 July 2000, in association with a Pollock stock assessment survey aboard the NOAA ship Miller Freeman. Observers scanned for cetaceans with 25x (Big Eye) binoculars from the flying bridge (platform height = 12m) at survey speeds of 18.5-22 km h-1 (10-12 knots). Transect survey effort ... was 2194 km in 2000, in a study area 158,561 km2. An additional 402 km of trackline was surveyed in 2000, respectively, while in transit to or from pollock survey way points. Fin whales (Balaenoptera physalus) were the most common large whale, and Dall's porpoise (Phocoenoides dalli) the most common small cetacean. In the SEBS (2000), uncorrected abundance estimates were: 683 (CV _ 0.32) fin whales, 102 (CV _ 0.50) humpback whales (Megaptera novaeangliae), 1003 (CV _ 0.26) minke whales, 9807 (CV _ 0.20) Dall's porpoise and 1958 (CV _ 0.21) harbor porpoise. Non-pollock echosigns observed near cetaceans, some of which may have been cetacean prey, were not routinely identified during trawl sampling because the research focus was on pollock abundance assessment. � 2002 Elsevier Science Ltd. All rights reserved. Clearly, additional surveys and concomitant assessment of cetacean prey are needed to define their role in the Bering Sea ecosystem better. Such surveys, combined with measures of local hydrography and prey field should be the goal of future cetacean assessments.

Purpose:
Cetacean distribution and abundance in the Bering Sea is poorly described, with even recent reviews of cetaceans' role in the ecosystem reliant on data from the commercial whaling era (e.g. Springer et al., 1999; Springer, McRoy, & Flint, 1996). Commercial harvests of baleen whales (mysticetes) were extensive in the North Pacific and Bering Sea (Miyashita, Kato, & Kasuya, 1995), especially between ... 1835 and 1850 for North Pacific right whales (Webb, 1988) and between 1965 and 1979 for fin and humpback whales (Wada, 1981). The effect of these large-scale removals on the marine ecosystem is largely unknown. Similarly, some species of toothed whales (odontocetes) are sometimes killed in the course of commercial fishing operations. Pelagic dolphins and Dall's porpoise were especially vulnerable during high seas driftnet fishing in the North Pacific in the 1980s (Hobbs & Jones, 1993), and once again the long-term ramifications of these removals are unknown. One reason for this uncertainty is the lack of data on current cetacean distribution and estimates of abundance in pelagic environments. Surveys to determine distribution and abundance are costly and, therefore, often confined either to coastal waters where the logistics are most practical (e.g. Barlow, 1995), or to areas of the ocean where marine mammal mortality associated with commercial fishing is particularly high (e.g. Hobbs & Jones, 1993). The pelagic waters of the Bering Sea have not met either criteria and so are comparatively undersampled for cetaceans. Cruises were undertaken in association with the Alaska Fisheries Science Center/Resource Assessment and Conservation Engineering (AFSC/RACE) division to conduct visual surveys for cetaceans during the semi-annual acoustic trawl surveys for walleye pollock (Theragra chalcogramma) on the Bering Sea shelf (Tynan, 1999). Biologists from the AFSC/National Marine Mammal Laboratory (NMML) were able to join subsequent surveys in the southeastern Bering Sea (SEBS) in 2000, providing an opportunity to describe cetacean distribution and calculate abundance over a broad area of the Bering Sea shelf.

DISTRIBUTION LIABILITY: Not to hold OBIS-SEAMAP liable for errors in the data. While we have made every effort to ensure the quality of the database, we cannot guarantee the accuracy of these datasets. Also please refer to Use Constraints.

Use Constraints
Not to use data contained in OBIS-SEAMAP in any publication, product, or commercial application without prior written consent of the original data provider. To cite both the data provider and OBIS-SEAMAP appropriately after approval of use is obtained. Also please refer to Distribution Liability.